Mapped: the £150bn megaproject that aims to protect Britain from energy shocks
Thousands of miles of new power lines are needed to deliver climate targets and energy security, but bills will rise in the short term and opponents are mobilising Britain is embarking on one of the largest overhauls of its electricity grid in generations – a megaproject in which five times more infrastructure will be built by 2030 than was constructed during the previous three decades. Tens of…
Britain is undertaking one of the most extensive overhauls of its electricity grid in recent history, a £150 billion megaproject aimed at safeguarding the nation from energy shocks. The scale of the project is monumental, with five times more infrastructure planned by 2030 than was constructed in the previous three decades. This massive investment will see the creation of thousands of miles of new power lines, subsea cables, and converter stations to connect an expanding fleet of wind and solar farms, transmitting clean energy to where it is needed most.
The primary catalyst for this grid transformation is the increasing vulnerability of the UK's energy system to international market volatility, following global shocks such as Russia’s invasion of Ukraine and the Iran war. These events have exposed the UK's reliance on fossil fuels, which has led to skyrocketing energy prices and greater CO2 emissions.
The current state of Britain's ageing grid simply cannot handle the influx of new energy generated by renewables. According to Professor Keith Bell of the University of Strathclyde, without sufficient transmission network capacity, the country will not be able to fully utilize renewable energy resources and will become more dependent on fossil fuels, thereby increasing its vulnerability to fossil fuel price shocks and higher CO2 emissions.
To address this issue, over 4,000 miles of new power lines will be required by 2041, along with significant improvements to existing cables. This expansion will be visible, cutting across the countryside and impacting rural communities, leading to protests from some residents who fear an "energy invasion."
Household energy bills are set to rise in the short term as a result of this grid transformation. The National Energy System Operator (Neso) has estimated that £64 billion will be spent on transmission projects by 2030, with an additional £89 billion invested beyond that. These investments will be largely covered by surcharges on household bills.
While these upgrades will eventually help lower costs by reducing dependence on expensive gas generation, the National Audit Office has warned that dozens of grid projects risk delay, potentially placing further strain on consumers. However, the failure to invest in grid upgrades also comes with costs, as highlighted in the explainer below.
These upgrades will be primarily funded through household energy bills, on top of the already rising electricity prices driven by global energy shocks. The energy regulator Ofgem has announced a 4% increase in the energy bill price cap from October, reaching its highest level in three years, driven by increases in wholesale gas prices.
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